Description
In the Linux kernel, the following vulnerability has been resolved:

rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc()

With a list_for_each() loop, if we don't find the item we are looking for
in the list, then the loop exits with the iterator, which is "dbell" in
this loop, pointing to invalid memory.

This code uses the "found" variable to determine if we have found the
doorbell we are looking for or not. However, the problem that the "found"
variable needs to be set to false at the start of each iteration,
otherwise after the first correct doorbell, then everything is marked as
found.

Reset the "found" to false at the start of the iteration and move the
variable inside the loop.
Published: 2026-08-28
Score: n/a
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The RapidIO TSI721 driver contains a logic error in its database processing routine. During a list traversal, a boolean flag is not reset for each iteration, causing the loop to incorrectly believe an entry was found even when it was not. As a result, the kernel may dereference an invalid pointer, leading to a kernel crash or potential denial of service. This defect is a classic invalid memory reference flaw, corresponding to CWE-476.

Affected Systems

Linux kernel installations that include the RapidIO TSI721 driver are vulnerable. Specific affected versions are not publicly listed.

Risk and Exploitability

The likely attack vector involves interacting with the RapidIO interface to trigger the faulty doorbell handling path; an attacker with sufficient privileges could cause a kernel crash. No EPSS score is available and the vulnerability is not listed in the CISA KEV catalog, indicating that no public exploits are known. The exploit would require the capability to reach the RapidIO driver path, after which a crash could be induced.

Generated by OpenCVE AI on August 28, 2026 at 13:07 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the kernel patch that resets the found flag in tsi721_db_dpc() and rebuild the kernel
  • If the RapidIO TSI721 device is not required, disable the driver or block user access so the fault cannot be triggered
  • Monitor system logs for RapidIO errors or kernel panics and apply any future updates promptly

Generated by OpenCVE AI on August 28, 2026 at 13:07 UTC.

Tracking

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Advisories

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History

Fri, 28 Aug 2026 13:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-476

Fri, 28 Aug 2026 07:30:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc() With a list_for_each() loop, if we don't find the item we are looking for in the list, then the loop exits with the iterator, which is "dbell" in this loop, pointing to invalid memory. This code uses the "found" variable to determine if we have found the doorbell we are looking for or not. However, the problem that the "found" variable needs to be set to false at the start of each iteration, otherwise after the first correct doorbell, then everything is marked as found. Reset the "found" to false at the start of the iteration and move the variable inside the loop.
Title rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Subscriptions

Linux Linux Kernel
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-28T06:48:55.678Z

Reserved: 2026-08-26T14:34:25.778Z

Link: CVE-2026-80645

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-28T08:16:49.423

Modified: 2026-08-28T08:16:49.423

Link: CVE-2026-80645

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-28T13:15:05Z

Weaknesses